Directional radio receiving system



July 3, 19234. 1,460,801

' R. H. AMARRIOTT DIRECTIONAL RADIO RECEIVING SYSTEM Filed June 20. 1921 am: "uw

Patented july 3, $23.

RRERT E. MAERITT, OF BREIHTETN, WASHNGON.

orerucrronar. inepto nncnrvno ersten.

Application flied Slime 2D, i821. eriel Hc. 478,98015@ (mLED 'UR'DER THE ACT 0F ERCE 3, 1883, 22 STAT. L., 625.)

To all rl2/'wm 'it may camcom:

Be it known that Bonner H. MARRIOTT, a citizen of the United States of America, and resident of the city of Bremerton, in 5 the county of Kitsap and State of l/Vashinpton, have invent/eu certain new and usefu Improvements in Directional Radio Receiving Systems, of which 'the oliowing is a spec1fication.

This application is filed under the provisions of the act of March 3, 1883 and ap- Hcant hereby consents that the invention J isclosed herein may, if and when patented, be used by the Government or any o' its ofn icers or employees in the prosecution of Work for the Government, or by any other person-in the United States, Without the ,pavment to him of any royalty thereon.

y invention relates to radio systems having for its object the unidirectionl control of the receipt of signals. To get a unidirectional receiving,r arrangement, combine the two-directional characteristics of a periodic loop antenna with thc four-direction l5 characteristics of' the loop to ground, in the loop circuit via a thermiomic repeater, to neutralize one of the two-directional characteristics of the loop.

This arrangement eliminates the separate open antenna which have been used With eriodiq loops :for unidirectional eliects und 1s less critical for adjustment. Also this arrangement permits of the use of the periodic loo in place of the less eilicient aperiodic oop and loop to ground which has been described for unidirectional effects by E. F. W. Alexanderson in Patent No. 1,375,992.

In -the accompanying diagram 1 have shown the type of apparatus and the manner of assembling and connecting it to secure the desired result.

In the diagram; antenne 1, inductance 2, and condenser 3, comprises a loop antenna circuit. The loop circuit is connected to ground 8 through a path 4, 5, 22, which 1s coupled across a portion of resistance 5 to the filament 6 and grid 7 of a thermiomic repeater. 22 represents an inductance and 23 a capacity. The plate circuit coupling 50 to the loop circuit is completed by the connection of plate 9 and battery 10 to a point 11 in the loop circuit. The loop circuit is coupled by inductance 2 to inductance 12 of the circuit containing l2 and condenser 13. The circuit 12, 13 is connected at 111 and 15 to a radio detector 16.

Radio Waves 'from one direction inthe plane of the loop set up currents in the loop circuit 1, 2 3 and in the ,loop to ground circuit, 1, 4, 5-I 22, 23, 8. By a coupling as shown in this ligure across a por tion of resistance 5, the effects in 1, 22, 23, 8 are impressed on the repeater 6,:7, 9, 10 and repeated in the loop circuit through connections t and 11 to neutralize the loop `circuit currents. lRadio waves from the opposite direction set up loop circuit currents and currents to ground which when repeated do not neutralize the loop circuit currents and the combined current effects are transferred to the detector 16 via the cou pling 2 to 12 and circuit 12, 13.

ln practice waves and disturbances of various lengths and forms may be receivable and loops or" various dimensions located in lvarious places and'lor` connection to various types of receiving circuits may be desirable. The loops may ior example be on buildings, dry sand, hills, ships or over a salt 'water marsh. These variations may be adjusted for by suitable changes of the capacities, inductances, resistances, coulings, filament current and plate battery.

What I claim as my invention is:

In a. radio receiving system, a loop antenne circuit, an earth connection therefor, a thermiomic repeater' having its rid and filament connected with said groun connection and a connection from the plate circuit of sai'd thermiomic repeater to loop circuit, whereby the loop-to-ground potentials are repeated and impressed upon the loop antenne circuit.

Signed at Seattle, King County, 4lWash- 95 ington, this 15th day of June, 1921.

ROBERT H. MARRIOTT.. 

